u/Final_Influence_6569

Our house was built in 1920 (Minneapolis, working class neighborhood), but the bathroom was redone in the 1950s. I'm giving the bathroom a facelift (new paint, hardware, fixing tile, etc.). I want to remove the old paint because the people who owned it before us did a terrible job, but it also seems like they painted over wallpaper (ripples in parts, glue? bleeding through). I went to scrape back a section (with IR removal help) and several layers came loose along with this thicker and brittle under layer. Anyone know whats going on here and what I'm looking at? The whole house (that we know of) is plaster.